BS ISO 23840:2021 pdf free download – Water hydraulics – Water-hydraulic pumps一Methods of testing and representing basic steady-state performance.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in Iso 4391 and ISO 5598 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
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— IEC Electropedia: available at https://wwve1e..c1rpcthaorg/
3.1
water-hydraulic pump
positive displacement pump that transforms mechanical energy into water-hydraulic energy with water as the system fluid
3.2
flow rate of the pump under test
flow rate measured at the outlet port of the pump under test
3.3
pump volumetric efficiency
ratio of the effective output flow rate to the derived output flow rate
3.4
hydromechanical pump efficiency
ratio of the derived torque to the effective torque
3.5
inlet gauge pressure of the pump under test
measured gauge pressure at or near the suction port of the pump under test
Note I to entry: The value of “inlet gauge pressure of the pump under testTM shows either positive or negative.
6.5 Measurement procedure
Pump basic steady-state performance shall be measured in the rotational frequency range of the minimum to maximum working rotational frequencies (e.g. 500 mm-1 to 1 800 mm-’) and in the outlet gauge pressure range of the minimum to maximum working pressures (e.g. the pressure obtained by fully releasing the main relief valve (Key 9 of Figure 1) to 16 MPa).
Measurements shall be taken according to the following procedure using the test circuit shown in EigureJ..
1) Set the rotational frequency of the pump under test to the minimum working rotational frequency (e.g. 500 mini).
2) Set the outlet gauge pressure of the pump under test to the pressure obtained by fully releasing the main relief valve (Key 9).
3) Measure the effective torque and rotational frequency by a torque meter (Key 2) and a tachometer (Key 3), respectively, after their values have reached a steady-state.
4) Measure the inlet gauge pressure, outlet gauge pressure and flow rate of the pUmp under test by an inlet pressure gauge (Key 6), an outlet pressure gauge (Key 5) and by a flowmeter (Key 10), respectively.
5) Set the outlet gauge pressure of the pump under test to a specified value (e.g. 1, 2, 3, … MPa) by adjusting the main pressure relief valve (Key 9).
6) Repeat the procedures 3) to 5) up to the maximum working pressure (e.g. 16 MPa) with the rotational frequency kept at a constant.
7) Repeat the procedures 2) to 6) at increased rotational frequencies up to the maximum rotational frequency (e.g. 1 800 mm1).
Table B.1 shows permissible variation of mean indicated values of controlled parameters.
Each set of readings taken for a controlled value of a selected parameter shall be recorded oniy where the indicated value of the controlled parameter is within the limits shown in Table B1. If multiple readings of a variable are recorded the mean values shall be documented while the controlled parameter is within the operating limits.